powerpc/mpic_msgr: add lock for MPIC message global variable

Also fix issue of accessing invalid msgr pointer issue. The local
msgr pointer in fucntion mpic_msgr_get will be accessed before
getting a valid address which will cause kernel crash.

Signed-off-by: Mingkai Hu <Mingkai.hu@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

diff --git a/arch/powerpc/sysdev/mpic_msgr.c b/arch/powerpc/sysdev/mpic_msgr.c
index 6e7fa38..dc1cfe3 100644 (file)
--- a/arch/powerpc/sysdev/mpic_msgr.c
+++ b/arch/powerpc/sysdev/mpic_msgr.c
@@ -27,6 +27,7 @@
 
 static struct mpic_msgr **mpic_msgrs;
 static unsigned int mpic_msgr_count;
+static DEFINE_RAW_SPINLOCK(msgrs_lock);
 
 static inline void _mpic_msgr_mer_write(struct mpic_msgr *msgr, u32 value)
 {
@@ -56,12 +57,11 @@ struct mpic_msgr *mpic_msgr_get(unsigned int reg_num)
        if (reg_num >= mpic_msgr_count)
                return ERR_PTR(-ENODEV);
 
-       raw_spin_lock_irqsave(&msgr->lock, flags);
-       if (mpic_msgrs[reg_num]->in_use == MSGR_FREE) {
-               msgr = mpic_msgrs[reg_num];
+       raw_spin_lock_irqsave(&msgrs_lock, flags);
+       msgr = mpic_msgrs[reg_num];
+       if (msgr->in_use == MSGR_FREE)
                msgr->in_use = MSGR_INUSE;
-       }
-       raw_spin_unlock_irqrestore(&msgr->lock, flags);
+       raw_spin_unlock_irqrestore(&msgrs_lock, flags);
 
        return msgr;
 }